House Minority Leader Nancy Pelosi told ABC News in an exclusive interview that Democrats "have a very good chance of winning the House" majority in the 2012 elections, pointing to Medicare as the key issue that could propel her party back into control of the lower chamber of Congress. "We just take it, as I say to the members, one day, one good day, one good week, one good month, one good quarter at a time," said Pelosi, D-Calif., in an interview for ABC News' Subway Series with Jonathan Karl. Pelosi discussed a wide array of subjects, ranging from military...